Consolidated Statements of Comprehensive Earnings - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net loss	$ 54.7	$ 2,078.6	$ (1,269.1)
Other comprehensive (loss), before tax:
Foreign currency translation adjustment	139.2	(1,583.5)	(1,340.9)
Change in unrecognized (loss) gain and prior service cost related to defined benefit plans	(18.7)	279.1	73.9
Net unrealized gain (loss) on available-for-sale fixed income securities	1.5	(2.8)	(1.1)
Other comprehensive loss, before tax	(42.6)	(884.0)	(775.2)
Income tax (benefit) provision	(56.4)	132.9	111.1
Other comprehensive earnings (loss), net of tax	13.8	(1,016.9)	(886.3)
Comprehensive earnings (loss)	68.5	1,061.7	(2,155.4)
Cash flow hedging relationships
Other comprehensive (loss), before tax:
Net unrecognized gain (loss) on derivatives in hedging relationships	13.9	(36.9)	36.1
Net Investment Hedging
Other comprehensive (loss), before tax:
Net unrecognized gain (loss) on derivatives in hedging relationships	$ (178.5)	$ 460.1	$ 456.8